Plastic sizer



FIG. 1 is a perspective view of a plastic sizer showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is another perspective view thereof.

The broken lines shown in the drawing disclosure are for illustrativepurposes only and form no part of the claimed design.

The ornamental design for a plastic sizer, as shown and described.